Multiple choice

The explosivity of a volcano is mainly due to

  1. the increased viscosity from the magma's Silica content

  2. The oxygen content of the rock

  3. the temperature extremes in the nearby mantle

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

High silica content increases magma viscosity, preventing gas bubbles from escaping easily. This pressure buildup leads to explosive eruptions.